Secondary battery case provided with fastening strengthening unit

Abstract

In order to achieve the above described object, a secondary battery case according to the present invention includes: a can configured to have a lower plate and a raised side wall which extends upward from the lower plate and has an inner space of which the upper side is open; and a cap configured to have an upper plate and a dropped side wall which extends downward from the upper plate, has an inner space of which the lower side is open, and is inserted into the inner space of the can in order to isolate the inner space of the can from the outside so that the lower end of the dropped side wall is received by the upper surface of the lower plate. The present invention may include a fastening strengthening unit which surrounds a partial section of the dropped side wall with a partial section of the raised side wall so that fastening and sealing are improved when the can and the cap are fastened with each other. According to the secondary battery case of the present invention, a connection structure for the can and the cap is simplified, and thus product size can be reduced, the fastening and the sealing between the can and the cap are improved, and conductivity with an electrode assembly is improved.

Description

technical field [0001] The present invention relates to a casing for a secondary battery composed of a battery can and a top cover. More specifically, it relates to a casing that improves the coupling force and airtightness between the battery can and the top cover, and improves the electrical conductivity with the electrode assembly. Cases for secondary batteries. Background technique [0002] In general, a secondary battery is a battery that can be charged and discharged differently from a non-rechargeable primary battery. Recently, a high-power secondary battery using a non-aqueous electrolyte with high energy density has been developed. One battery unit is packaged in the form of a battery pack. In the case of low-capacity batteries, it is used in portable small electronic devices such as mobile phones, notebook computers, and cameras, and in the case of devices that require high power, such as power supplies for driving motors such as electric vehicles, dozens of such b...

AI Technical Summary

Problems solved by technology

[0007] However, in the conventional secondary battery case constructed as described above, when the top cover 20 is lifted as the internal pressure increases, the space between the upper surface of the flange 12 and the bottom surface of the top cover 20 will expand. Therefore, There is a problem that the internal electrolyte and gas flow out to the outside

Of course, if the length of the flange 12 is lengthened, or the flange 12 surrounded by the edge of the top cover 20 is further bent, the phenomenon that the electrolyte and gas are flowed out can be reduced, but if the length of the flange 12 is lengthened, then There is a problem that the overall size of the secondary battery becomes larger, and another process is required to bend the flange 12

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